Omron NX Series Hardware User Manual page 122

4 Designing the Power Supply System
l Blocks
A block consists of the Unit that supplies the NX Unit power and the range of Units to which that
Unit supplies the NX Unit power.
For example, in the configuration in the following figure there are two blocks in the CPU Rack: the
block with the CPU Unit and the block with the Additional NX Unit Power Supply Unit.
Internal
power
supply
circuit
Unit power supply terminals
Unit power supply
(24 VDC)
The total of the required Unit power supply capacity for these two blocks is the required power sup-
ply capacity of the Unit power supply for the CPU Rack.
Precautions for Correct Use
Use the same Unit power supply to supply the Unit power to one CPU Rack. If you supply pow-
er from different Unit power supplies, differences in electrical potential may cause unexpected
currents in the NX Unit power supply, which may result in failure or malfunction.
l Calculation Example
This section provides a calculation example for the configuration example that is given in 4-2-2 Cal-
culation Example for the NX Unit Power Supply on page 4-11.
CPU Unit
Additional I/O Power Supply Unit NX-PF0630
Digital Input Unit
Relay Output Unit
• The NX Unit power supply efficiency of the CPU Unit is 80%.
In this configuration example, there is only one block, the CPU Unit block.
Required power supply capacity of Unit power supply to CPU Rack
= Required Unit power supply capacity of CPU Unit block
4-22
CPU Unit block
NX Unit connected
to the CPU Unit
NX-series
NX102 CPU Unit
Internal
circuits
Internal circuits
NX Unit power supply
Name Model
NX102-1200 1
NX-ID3317
NX-OC2633
Additional NX Unit Power Supply Unit block
NX Unit connected to the Additional
NX Unit Power Supply Unit
Additional NX Unit Power
Supply Unit
Internal Internal Internal Internal
circuits circuits circuits circuits
Internal
power
supply
circuit
Unit power supply terminals
Quantity Power consumption/Unit
5.80 W
1 0.85 W
4 0.90 W
3 1.20 W
NX-series NX102 CPU Unit Hardware User's Manual (W593)
End
Cover
Internal Internal Internal
circuits circuits circuits
NX Unit power supply